Abstract:

In order to further promote the industrialization of supercritical CO2 anhydrous dyeing system, the energy consumption was calculated by the available energy analysis method. The energy balance equations of each unit in the system were established, the unknown parameters of CO2 were calculated through the PR equation, and the energy loss of the system was calculated by using the residual function method. The effects of dyeing temperature on the efficiency of the heating/dyeing unit and throttle pressure on the efficiency of refrigeration unit were investigated. The results show that the sum of the available energy loss in the heating/dyeing unit and the refrigeration unit accounts for more than 60% of the inputted available energy of the system, which is the key parts for the system energy saving. Moreover, the available energy efficiency of the heating/dyeing unit rises from 7.1% to 16.0% when the dyeing temperature is raised from 353.15 K to 393.15 K. The available energy efficiency of the refrigeration unit rises from 19.6% to 26.1% when the throttle pressure reduces from 6 MPa to 4 MPa. According to the analysis, the system available energy efficiency is improved effectively by raising the dyeing temperature and reducing the throttle pressure.

Key words: supercritical CO2, dyeing system, anhydrous dyeing, available energy analysis, energy saving